Which of the following diseases is/are spread by a vector?

Dengue

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Malaria

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Cholera

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Typhoid

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Solution

The correct option is B Malaria
Dengue fever is caused by a virus while malaria is caused by a protozoan called Plasmodium. Both these diseases are spread by mosquitoes acting as vectors. Dengue is spread by the female Aedes mosquito while the female Anopheles mosquito spreads malaria. Cholera is a water-borne disease and typhoid is caused by contaminated food and water. These diseases do not spread by vectors.

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